Comparison
Chinilla vs Excalidraw
Excalidraw and Chinilla solve different problems. Here is the honest version, not the marketing version.
Short answer: Excalidraw draws pretty pictures of systems. Chinilla simulates systems. If you want a sketch for a slide, use Excalidraw. If you want to find out whether the design holds under load, use Chinilla.
| Feature | Excalidraw | Chinilla |
|---|---|---|
| Primary purpose | Hand-drawn sketching, whiteboarding | System design simulation |
| Live simulation engine | No | Yes (deterministic, discrete-event) |
| Components have behavior | No (decorative) | Yes (12 behavior modes) |
| Traffic and load modeling | No | Yes (rate, capacity, queue depth) |
| Failure modes (drops, retries, breakers) | No | Yes (filter, retry, circuit breaker) |
| Real-time collaboration | Yes (excellent) | No (single-user editing) |
| Sketch and freeform shapes | Yes (its strength) | No (structured components only) |
| Code-to-diagram | No | Yes (15+ languages) |
| GitHub repo to diagram | No | Yes (Pro) |
| AI design partner | No (some plugins) | Yes (xAI Grok, Pro) |
| Templates for system design interviews | No | Yes (16 templates, 8 problems) |
| Export to Python or Mermaid | No | Yes |
| Open source | Yes (MIT) | No (free tier available) |
| Free tier | Fully free | Yes (3 projects, full engine) |
When to use Excalidraw
- Quick sketches for meetings or slides
- Collaborative whiteboarding sessions
- Hand-drawn aesthetic for blog posts and READMEs
- Anything where the picture itself is the deliverable
When to use Chinilla
- System design interview prep with real running templates
- Validating a service topology before writing code
- Teaching how queues, retries, and circuit breakers actually behave
- Stress-testing a design against traffic spikes and outages
- Anywhere you would benefit from "press play and see what happens"
Honest tradeoffs
Excalidraw is the better choice for any case where the diagram is the artifact. The drawing experience is delightful, the open-source community is excellent, and live collaboration is best-in-class.
Chinilla is the better choice when the diagram needs to do something. The tradeoff is that you cannot draw arbitrary shapes; you build from a fixed vocabulary of components and behaviors. That constraint is the price of running the simulation.